countermark

• ⇰ A mark or token added to those already existing, in order to afford security or proof; as, an additional or special mark put upon a package of goods belonging to several persons, that it may not be opened except in the presence of all; a mark added to tha
• ⇰ An artificial cavity made in the teeth of horses that have outgrown their natural mark, to disguise their age.

• ⇰ To apply a countermark to; <as>as, to <ex>countermark</ex> silverware; to <ex>countermark</ex> a horse's teeth</as>.